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Ask QuestionPosted by Jyoti Kumari 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Catenation : The self linkage is known as catenation. The property of catenation is responsible for the occurrence of innumerable oragnic compounds.
It is the binding of an element to itself through covalent bonds to form chain or ring molecules.
Examples : Carbon is the most common element that exhibits catenation property. That means it can form long hydrocarbon chains and rings like benzene.
Posted by Meenal Khandelwal 5 years, 2 months ago
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Nila N 5 years, 2 months ago
Posted by Meenal Khandelwal 5 years, 2 months ago
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Meghna Thapar 5 years, 2 months ago
Ophthalmoscopy is done as part of a routine physical or complete eye examination. It is used to detect and evaluate symptoms of retinal detachment or eye diseases such as glaucoma. The direct ophthalmoscope allows you to look into the back of the eye to look at the health of the retina, optic nerve, vasculature and vitreous humor. This exam produces an upright image of approximately 15 times magnification. The Large aperture is used for a dilated pupil after administering mydriatic drops.
Yogita Ingle 5 years, 2 months ago
Ophthalmoscopy, also called funduscopy, is a test that allows a health professional to see inside the fundus of the eye and other structures using an ophthalmoscope .
Posted by Ankit Raj 5 years, 2 months ago
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Ipsita Seal 5 years, 2 months ago
Sabari Krishna 5 years, 2 months ago
Mukesh Maurya 5 years, 2 months ago
Chandu G 5 years, 2 months ago
Meghna Thapar 5 years, 2 months ago
Substances conduct electricity because they contain charged particles that are able to move. When a voltage is applied to a metal, the delocalised electrons travel through the lattice structure. The movement of these charged particles forms an electric current. Electric current is the flow of electrons in a wire. In metals, the outer electrons of the atoms belong to a 'cloud' of delocalised electrons. They are no longer firmly held by a specific atom, but instead they can move freely through the lattice of positive metal ions. Metals are good conductors of heat.
Posted by Shagun Tyagi 5 years, 2 months ago
- 2 answers
Yogita Ingle 5 years, 2 months ago
Given, focal length of convex lens (f)
= + 40 cm = + 0.4 m
Power of lens = 1/f (in meter)
= 1/ (+ 0.4) m
= + 2.5 D
So, Power of convex lens is + 2.5 D.
Posted by Anshu . 5 years, 2 months ago
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Vaibhav Singh Parmar 5 years, 2 months ago
Posted by Shagun Tyagi 5 years, 2 months ago
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Tarannum Jahan 5 years, 2 months ago
Vaibhav Singh Parmar 5 years, 2 months ago
Posted by Koushick R 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
Ferrous sulfate is an iron salt with the chemical formula FeSO4. Ferrous sulfate is an iron salt popularly known as green vitriol. Imferon and iron dextran are injectable iron. Ferrous fumarate, ferrous gluconate, and ferrous sulfate are generic names for oral iron. Ferrous sulfate is by far the best and cheapest for iron supplement.
Posted by Priyanka Solanki 5 years, 2 months ago
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Avii Singh 5 years, 2 months ago
Posted by Shreya Ojha 5 years, 2 months ago
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Meghna Thapar 5 years, 2 months ago
Ammonia doesn't contain hydroxide ions, but it reacts with water to produce ammonium ions and hydroxide ions. ... A weak base is one which doesn't convert fully into hydroxide ions in solution. When a weak base reacts with water, the position of equilibrium varies from base to base. Ammonia releases hydroxide ions when it dissolves, but only because the ammonia steals a proton from a water molecule: ... In the case of NaOH, the hydroxide ions come from the crystal lattice of the solid, and in the case of NH3 they come from dissociated water molecules whose protons have combined with NH3 to form, NH4+.
Posted by Neha Kumari 5 years, 2 months ago
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Nitin Mishra 5 years, 2 months ago
Posted by Yogita Balhara 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
When the valence electrons are represented as dots circling the elements it is known as the elemental structure with electron –dot.
Thus for option i) we can write Sodium (2, 8, 1) = Na with one electron at the top. Again for Oxygen (2, 6) = O with two electrons each on three sides.
For Magnesium (2, 8, 2) = Mg with two electrons on the top.
The formation of Na20 and MgO can be written as Mg2+ + O2 (2-).
In Na2O, Na+ and O2- ions are present and in MgO, Mg2= and O2 (2- ) ions are present.
Posted by Anjali Manger 5 years, 2 months ago
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Jaat Shab 5 years, 2 months ago
Losmina X A , Roll No. 23 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Some concave mirror uses are listed in the points below.
- Shaving mirrors
- Head mirrors
- Ophthalmoscope
- Astronomical telescopes
- Headlights
- Solar furnaces
Posted by Aditya Shejal 5 years, 2 months ago
- 2 answers
Nikhil Kumar Singh 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Uses of Sodium Hydroxide
(1) It is used for making soaps and detergents.
(2) It is used for making artificial textile fibres.
(3) It is used in the manufacture of paper.
(4) It is used in purifying bauxite ore.
Posted by Toshank Srivastava 5 years, 2 months ago
- 2 answers
Gaurav Seth 5 years, 2 months ago
magnification(m) = -3 (as image is real)
object distance(u) = -10cm
image distance (v)=?
we know that m= -v/u
-3 = -v /-10
-3 = v/10
v =-3 * 10
v = - 30 cm
thus the image is 30 cm away from the concave mirror
A K47 5 years, 2 months ago
Posted by Shubham Kumar 5 years, 2 months ago
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Posted by Anirudh Jaat From Haryana 5 years, 2 months ago
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Meghna Thapar 5 years, 2 months ago
When magnesium burns, it reacts with the oxygen found in air to form a powdery ash called magnesium oxide. Chemical equation: Magnesium plus Oxygen gives Magnesium oxide. When magnesium reacts with oxygen, it produces light bright enough to blind you temporarily. Magnesium burns so bright because the reaction releases a lot of heat. As a result of this exothermic reaction, magnesium gives two electrons to oxygen, forming powdery magnesium oxide (MgO).
Posted by Eeba Mahmood 5 years, 2 months ago
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Meghna Thapar 5 years, 2 months ago
Transport of water and minerals
Plants need water to make food through the process of photosynthesis and minerals for making proteins. Thus, a plant absorbs water and minerals from soil through roots and transport it other parts like stem, leaves, flowers etc. It is through two kinds of elements of xylem tissue called, xylem vessels and tracheid that water and minerals move from roots of a plant to its leaves.
Xylem vessels
Xylem vessel is a long tube made up of dead cells joined end to end. It is a non-living tube which runs from roots of the plants and runs through the stem and reaches every leaf. The end walls of the cells are broken so that an open tube is formed.
Xylem vessels do not have cytoplasm or nuclei and the walls of the vessels are made of cellulose or lignin. Other than transporting water and minerals, xylem vessel also provides strength to the stem and keeps it upright. This is because lignin is very hard and strong. Wood is made of lignified xylem vessels. Xylem vessels have pits in their cell walls where lignin is not deposited. Either xylem vessel or both xylem vessel and tracheid transport water in flowering plants.
Posted by Nishant Kumar 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
- Xylem transports water and minerals obtained from the soil.
- Phloem transports products of photosynthesis from the leaves to other parts of the plant.
Posted by Nishant Kumar 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Kidneys play a very important role in human osmoregulation. They remove wastes and extra water from the blood to form urine. The kidneys regulate the amount of water in urine waste. Urine flows from the kidneys to the bladder through the ureters.
Posted by Nishant Kumar 5 years, 2 months ago
- 1 answers
Yogita Ingle 5 years, 2 months ago
1. In humans, digestion of food takes place in the alimentary canal, made up of various organs and glands.
2. In the mouth, food is crushed into small particles through chewing and mixed with saliva, which contains amylase for digesting starch.
3. Food passes through the pharynx and oesophagus to reach the stomach. Gastric juice contains pepsin (for digesting proteins), HCl and mucus.
4. In the small intestine, carbohydrates, proteins and fats are completely digested into glucose, amino acids, fatty acids and glycerol.
5. The villi of the small intestine absorb the digested food and supply it to every cell of the body.
6. The undigested food is removed from the body through the ****.
Posted by Asmita Belapurkar 5 years, 2 months ago
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A K47 5 years, 2 months ago
Posted by Prince Barua 5 years, 2 months ago
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Ayush Kashyap 5 years, 2 months ago
Posted by Priyanshi Dani 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
DNA determines the body design of an individual. The DNA that gets transferred from parents to offsprings makes them look similar. DNA copying is important for reproduction. Additional copies of DNA are made during replication which is necessary for the new cells formed after cell division. Moreover, some minor alterations during DNA replication are responsible for bringing variations in the long run.
Posted by Uihjku Dtgdrstj 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
Galvanometer
A galvanometer is a device (instrument) used for detecting feeble electric voltage, currents in a circuit. It has a coil pivoted (or suspended) between concave pole faces of a strong laminated horse shoe magnet. When an electric current passes through the coil it deflects. Its deflection is noted by attaching a pointer to the coil (or by using a lamp and scale arrangement). The deflection is proportional to the current passed.
The galvanometer coil has a moderate resistance (about 100 ohms) and the galvanometer itself has a small current carrying capacity (1 mA).
Posted by Vaibhav Shukla 5 years, 2 months ago
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Posted by Bidusmita Sahu 5 years, 2 months ago
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Posted by Nishant Kumar 5 years, 2 months ago
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Rewa Nimbhorkar 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Blood is a fluid connective tissue that consists of plasma, blood cells and platelets. It circulates throughout our body delivering oxygen and nutrients to various cells and tissues.
It has four main components: plasma, red blood cells, white blood cells, and platelets.
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